V1I1V2I2+-+-11111222211222VZIZIIZI=+=+1112211222IYV YVI=+1112211222VHIHVIHIHV=+Z-ParameterY-ParameterH-ParameterA two-port device can be described by a number of parameter sets. All of these network parameters relate voltages and currents at each of the two ports. These are the network variables.Network Characterization